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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152b1aa574e1b8ad99284477721cd940863320e0af1de3de5799497b42a087c6' 
  AND token = 'MZhACO4pjVW2o6jbz99khlyEhogToQPljfev/Yt6JJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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