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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c339fff8e5fe4ddb98f15bc1d0d3d4061ad3a72d0cff6fa5bedadac9b183aafd' 
  AND token = 'kFh4HDn/WgHVZzz0RjpdhntY/A3acG/MNrz6mTxgv4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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