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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acddf61022711e0d3ff624aaec0454910656dfe78c4ba884548bd4f20e723fb5' 
  AND token = 'ZWPdbc5R5rhqJR6QUUg0ZPyfukiz62U+lcySXTD0d5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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