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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb732bf372c286703097e3857ad2155f36f1b2e809a139b07992d9b7460272e' 
  AND token = 'SuHJXG1SZDZeLGee2gej51hk/rLmaA3no1/lawo65H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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