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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d61f987cd2f1fb5078ad7ae1b7fdc3c3db44ef342195c4632157daca0c491b3' 
  AND token = 'r+U3OBtt7ezTgbplMuwJ5+iadqKJjt3iGX1DpLEsG+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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