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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1044c26b30df0e0a55e779b042a3e80b75414945d4155242f0fb8bbfaff8e490' 
  AND token = '72Ut/c5UnhbP6GMyfM/tJvOyV0UzchMZPdizE6DKUWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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