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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19661cb4b14628a18aecdcc28d990f4bbddf47e52382e713285fdb8cb4517f09' 
  AND token = 't3OCuLqtt2dELFbzxPo4ozdG8pUSWgXjaLtFxjvYSaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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