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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc4a91d7cf6607426b54c001446ccaa59916f4efae2e36617a67e952667c77b' 
  AND token = 'j8nE0xYwx/hUxKtuZKpp4gDWFgcUGvKr/M6LfP2824E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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