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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de29361dce1ab4ccbc2eaca044ce89e0329772f0a34d58e713b6ebc158dacb6' 
  AND token = '3SLCXqc1GnqCJ/h5HhlmrshibmoFU7QbydIT1vuFyjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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