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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08b5f8c8ffb311387c8702464bf8807cfd1e900f1d8ee9f87254752c10310a7' 
  AND token = '3iARW1hS5oe/tLRjzS4Je3/rBs13F5ctxIopBj1IrMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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