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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a488ce1f8bf637fe337bed7530e181a643f73bd38a4792592bb511c1a10aba15' 
  AND token = 'ocVLgsqgXskGe5H2Z/J4TgeuYHaDif3OmrCDXw0G528=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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