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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2ccd6eb90eb35e7976d625dfd71dffb905b3e95479bd6482945cfaca5d3f07' 
  AND token = '9Ib13KRihrP1+1aq/+/SJ8ssr4wFsO3yciK/LUMNr+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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