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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3e30685cc2338c2aa57ff1625b3288639291e979d1f655712abdd27102f30d' 
  AND token = '9XtCFrBMmkQUatcfZnrhBXbAwoks4anOp/yPH/TVF/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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