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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69fd8a0e2cdd354a8d8d583a3b2e609b2926350444a3290346aa94a17c3e03d' 
  AND token = 'utWWTilW4cSSmnzHhD0OmtiQjcakdocyFfzMyub9r4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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