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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662144dfc3f93b1c5201986b95604f8bd3461eb64e9363865ca6a2a4738ef6fb' 
  AND token = 'b/mZabVHtbt2cfbq52GnATqaUlCuW0qB/u2xhUSmt3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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