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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafaadb63a8ae9366eb84a515dc0d52c8695578bf4129af2ac7d86976b5b2827' 
  AND token = 'sm4o2cgrk2XkiZo5UAyVdaw5gzKTnOqAawinsS6ajvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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