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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd979b1d11777e5ed06e11b91c64f0d1afcbccff963f427262b1a4f32270fb24d' 
  AND token = '/ljqf00OOcZrIkUjYD0FohGCD4V2UK7TpJvcTOr3Ewc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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