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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190bf3d6b19fce8799c92404b727fa6123ce8abd60ae7b2acf758a9761568b7d' 
  AND token = 'DoXgM+golMfftiuMaOEeae2NBj7A5hDZpArp4drQJUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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