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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06938fcd8060ce450e83c56e61f01d41ada1569775737a574b8b16e09807db42' 
  AND token = 'YuHP5w1UyX92NQhO6hdoaQXUl8ph96h/yj6udQBQPIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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