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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897513b85a99088f75556bb7885626910aa230a4320a51d3c318d02345355b4a' 
  AND token = 'IEh67pK4dwyRn5h9a9uKeKew2/PFQB6PMxHWDkYBbRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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