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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102faf0674f682d7a5f48e386571052bfe508822a79e7d040f7bcf11d8771eef' 
  AND token = 'nHQrMvx8uUHPuX99iDYAA11NSQAd3SS9ywSBwngHYo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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