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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9e736a6ed2dd0267c7191b45a9d66e2b3dc430c6fdad0567289a452efb6389' 
  AND token = 'ULlJLUcdme6FSd04RIrYJztiX3/elUy5FNyDRv+6UR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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