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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a721f3582cc90b9d69af8212ad1c21a9e9dec584fd92467c28a3ed2366945e' 
  AND token = 'C/4VTrO2MzaKIkpjsA59kplXsPUMXTI4fbgYs0vGDBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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