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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333c51e3345a79f3d04aa7b6c852a01f714c28dd4a6c907fc8e45cb0ed03247e' 
  AND token = 'MS7cl0N6NK2vUHXyK0Gi+EOl8VFTLces3foj7ezM5XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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