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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7986db48b8c1aa831f7845c50e087c03e32c433596f965938f0940cc65b48f2' 
  AND token = 'c0g4k8zdg7tuR3aIvZZs4xO0mwFIcQ0VLvOCEdpMN88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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