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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e444ac01ab6a6e8914320f0b7cdff6e8b636095d2ae5687cb32fba3e7eb635d2' 
  AND token = 'pXqRujOzxfLO/lXyOhnicjDuB+Xq2KtjD17yoxBdD/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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