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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ecced006f655ebda5264443be81dfbeee9a62cec656151661483e6959e6b86' 
  AND token = '3rv/8H74TrdxW0wJfpDtNQ1trG/ljnRfODVa2LfNUNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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