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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b52c8402355a2c9094201fabe390eb97172fbb5851f50a1ecbcbbd96fc1f3a' 
  AND token = '8n2K//jmRSRucAPJ2WtYvcZlU2JMxBsHUu5y0UE+b94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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