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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b6aaa66683827dc8306b4c0fffdda2d7f03837e3ff692574c928ef7401bc6a' 
  AND token = 'jL8STLoVKrTiP00EYPbCJc2zklxDiWePZtKuuR8wIsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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