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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c54e8a361189337401f8354314ca6fd760a32e04d608bc42feba44dc22e03d0' 
  AND token = 'hSSz1l3foU4rgcWF6btVIYQh0Z1AaMKCKIukj0ZWcRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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