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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efca4968c52e840ffbf02b424abbc1d8115d4f4675b022511167745e283c8e6c' 
  AND token = '6lFFQXl9nDp6Vk/9vyT2aTO7MV67kzvjqgRhzcNk2ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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