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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c6fb9d0ac52eae3a6cbb99cba3f0ce077a5bbf5dd464934c4c16f97bb52329' 
  AND token = 'ME+NNj3/yNlXCPSTFrJlQo/ox2L6/AYWcLfrmg2gTQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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