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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a9d01cddf8b93df938592e4d40123158b4359a10daa7d77d691127a9c1d6e4' 
  AND token = 'LVz1LcxgeoWCiJttoB9pK56vjbIdiTeWYP+3bgCw+xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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