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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796b24f18c91172456d9f083e805553381a2d930c1f5828f680071d02f83045f' 
  AND token = 'SR9eFQ2bDlY/U0c1Na/GYwTdE1Jnt+MfXI6shkUzl54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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