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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d67d8af374a9572faa07f79eaa791841fb50b803939cec8ead2e8e86fe91ca2' 
  AND token = 'A95wly7lKR9jelFwQ4TehpRokr4bdjB8InyZ1PfmEnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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