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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ff4ba29c259985838ddf3bb183f57a102a6583c8040bd4d776a98cec556e0d' 
  AND token = 'oW0Q2EKuIRGUPZPCs489ptSVHYbDXn00a1hT1HkpNaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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