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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee816c0231108f0e4ddd61753fd7f6f1f91535e34389581abf45836e8c52611' 
  AND token = 'NEeojFm9an9Jfd+WcrrMOOOjieOQwkr/GBMAJvUbTpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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