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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a28bfbec9ba02708d4d61aab0e2e5aff52bf8b28035ce18990128558e2a68f4' 
  AND token = 'Hfsja2f/xGJ+tSpPi+W/WQnQKHEo3n36k44mO++RzDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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