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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0679d8bc8ea290cd331be088939ac764307bc901b8a3186745a71b3f5458fb' 
  AND token = 'qIk7S7tNqm28EbAi1AFRUhmxRQqxQ9JHqln+c1amuwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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