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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd33c5c1d7766aad1064051bfd375a611f377cfa5500b0b43818ce498bbdc11b' 
  AND token = 'TKSMTyVAZrCF5fEPaqdMS3xnTykHOvRAAvATDnJfpEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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