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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90611a5e39fce22f038d84f464757c441abae4660da6da891e54d5e903036784' 
  AND token = '71zYLD5okzzS92AqwTK5BJlIbnX4yz3YI1ovUR91hwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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