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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5921cfc97cb40ce5be0b71521614b61a1bef8d16b419d52ecee9766bbe4bab' 
  AND token = 'pRLo7MvVA/kZ+oNfQe2HaV/hc5Pns03+bZMdLVwNST8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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