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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963361d92255919a9865c43e99f90c094b47204f52537e36dbcb27e6a3f1b21a' 
  AND token = 'mQNJ21Eauf9itwynuviV4r7AMwBsMU8c8V/yVFGGRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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