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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f8e9dcaf71f7dc898b99c5a7fe732ac14d9981e65d44a3f33430820c03bc7f' 
  AND token = 'kDoYJyWNh67NQVs9EdBjODjSiS2Tn1EwqFYGcnatqTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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