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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38013c91aa2cee62e85ed9a30824394cacf592044c4dee7b7b6059abf95498c8' 
  AND token = 'gBZIXYGs3ZB5IRnajDFSkkmufpd3WFq1ing8d2sOtjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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