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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee770a4f1ce545fb00c3298dec577bd999dfabe76390282633ffb0b83f50c58' 
  AND token = 'Bxn26O+64MOtajb5ddNKwY+59sSrwE1vVhXbP7rCJ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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