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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018a864ab39e8d8d96cf3652cca532a52f70bff1f0962be0e8a0e219d31d9d21' 
  AND token = 'AmPWqO/YgduxjxgB6XTvTfoNpof6JeelciYPU5ZAx5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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