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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf85360bc3fa910e8d9b19846953c62909620bfda2723d0b7c5a9746f606fe72' 
  AND token = 'ivYXpYHs7Kptx2DX1Qj3+1VUrMYlaOwWtW21u3ebqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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