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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34db7c6fa68c4d43304c2fd9786124974828e74ad830f4dd76dbcfd6ed46a49c' 
  AND token = 'eA6BdsoC7lm98XLH1Un8nm++Cp8JXFGmCwqC7hr93CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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