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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33bed9c66d9266be6e4b3e695256e2f9509c7c5718afd597ab535582ebdab26' 
  AND token = 'p6NbtB18QhDJa3qcn27r95btsRDFNGXo+5ZvSfHK05w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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