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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55106886f74ebf75d84937d1a4dd392eca6a7d5afd48f91739b6afd2db3eb9d' 
  AND token = 'l8IZHZG2PPpn7tZ2IKi8LJsHDN8bPIlPvU0DexHD//w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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