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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439eb43dae1a769bc77e2b17e10e236340781c51e24c38b5ca8b6170c1acebc0' 
  AND token = 'fuKz63aD8cnTT59aYodAlH+iGdvrqAoQobbyQ3UIFx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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