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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76523cbe2ee24332ecad8c49a05f0c52573b6ada2da556044f8ba236b1b29b68' 
  AND token = 'yoxPJbNB2VKOlYyaZ/I3vpVNxIW/I+b82vg2cXVw1Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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