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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feeda78c64bb049631a191d2fd26bbb8796b01bbed61c210cb5c10fe4814d05c' 
  AND token = '5y0c0noZ1zQCLkGulg9EGjTPL25TPuAzu+dSyCHm9kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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