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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99657a2c2ae72d07fa2e18d950cad9346a09fb6135f5c5a60c138da56a8192e1' 
  AND token = 'KEk6XKHNUUSVzvFUaajh/VS80GBVpidJFOfEIW1exTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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