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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54dabe68740a4e46ab87c0074372501bd9ea9dc4973954b588432d870d1b84cd' 
  AND token = 'Qm9Tb5Cuf9gxxqwkZhR8K3MZJPviQ3WabXkB804akmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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