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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5028eeb2ce46ed369b3095741e42bbb7754a8d054ba032a5fc5f054c0ec7e447' 
  AND token = 'nhvwl66HKINyaNfJ1Cx7HOQMPOtO9sKTIN8ARFZz2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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