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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e44e650d8230c4f258d92f88de105ab0b0b8e42c7aea61d849f49e850a2fda' 
  AND token = '1G9vRC+vpunP6u7jeUhOyA88OCo92pMlJdzdHueKBfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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