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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31389b706bd4af9e9c0ba1dbd1274cbc0f7623b47be39868f6e33358aa9b868' 
  AND token = 'hgfk6E9+hXuolQiE5eoUnpJG9VbJ7sZsKon4OivZtMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00201

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}