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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f5cf8df20f3b5ba95d041aa31a5d68663f5dfb6980942dd7ecdfac0bfbbb87' 
  AND token = 'KulT0a0nI/f+gfewKWL2Xz1W96PGDRD/VDtXCzxLJGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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