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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23d948c012b869807737cc172ba6f34c71d91bc29dfb62dfe30e4818b2f65ec' 
  AND token = 'SOPGn/jtBJys6XfiIO58Ryl8I2QkanRf7HjI2eBS1lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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