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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2663edd573bdc5a18012c32e96549a302e2ed9d2ddabad6cc4b9aa8c94d25fcd' 
  AND token = '7S6XTcV2unRPol9xPPjI8UhpfgbImxdfy/lDnWKah+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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