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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662c479d2a8f9abcf329b12a9dffa708ef5e5cd7d57516ead021d31d71c3e310' 
  AND token = 'cahYWgwD2hpZ8om0GkK1St5M3MjssSIMy6X6tVquk5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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