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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b22741ea2ab151b45c09094717d4812161cd4ccf27c3ffdbe2483d6bd10223' 
  AND token = '2chieCnjejxbAbcOopN8E7A8qd8jwNkXMZzHRPilzHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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