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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892ecc6b58cd400ad511b3987aaf0d3197260eaff3c7da20dd6955b59c61de2f' 
  AND token = '7nKoWzPY+JZBjAY3HW1m0yRaEAq6u+Vs289cLju4aDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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